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Influence of peculiarities of electronic excitation relaxation on luminescent properties of MgWO4

  • Condensed-Matter Spectroscopy
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Abstract

Luminescent properties of magnesium tungstate monocrystals grown by two different methods are studied. Only the exciton luminescence of these crystals themselves is observed. Temperature dependence of the low-energy range in the luminescence excitation spectra is described by the Urbach rule. Slope coefficient σ0 = 0.74 obtained from this dependence implies autolocalization of the excitons in MgWO4. The processes of electronic excitations relaxation are considered depending on the structure of valence band in MgWO4 and in other wolframites, ZnWO4 and CdWO4. In contrast to ZnWO4 and CdWO4, the d-states of the cation do not participate in formation of the MgWO4 valence band. Using the excitation spectra measured in the range of the fundamental absorption (4–20 eV), it is shown that this difference manifests itself in relaxation of electronic excitations and may be the cause of the relatively low light yield of MgWO4.

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Authors and Affiliations

  1. Moscow State University, Moscow, 119991, Russia

    N. R. Krutyak

  2. Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991, Russia

    D. A. Spassky

  3. Institute of Physics, University of Tartu, Tartu, 50411, Estonia

    D. A. Spassky

  4. Institute of Scintillation Materials, National Academy of Sciences of Ukraine, Kharkiv, 61001, Ukraine

    I. A. Tupitsyna & A. M. Dubovik

Authors
  1. N. R. Krutyak
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  2. D. A. Spassky
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  3. I. A. Tupitsyna
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  4. A. M. Dubovik
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Correspondence to N. R. Krutyak.

Additional information

Original Russian Text © N.R. Krutyak, D.A. Spassky, I.A. Tupitsyna, A.M. Dubovik, 2016, published in Optika i Spektroskopiya, 2016, Vol. 121, No. 1, pp. 50–57.

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Krutyak, N.R., Spassky, D.A., Tupitsyna, I.A. et al. Influence of peculiarities of electronic excitation relaxation on luminescent properties of MgWO4 . Opt. Spectrosc. 121, 45–51 (2016). https://doi.org/10.1134/S0030400X16070122

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  • DOI: https://doi.org/10.1134/S0030400X16070122

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